> Some 11% of Americans will join the Top 1% for at least one year during their prime working lives (age 25 to 60), according to research done by Thomas Hirschl, a sociology professor at Cornell University. But only 5.8% will be in it for two years or more.

> The same holds true for those lower on the income ladder. While just over half of Americans reach the Top 10% at least once in their careers, only 14% stay in it for a decade or more, Hirschl found. (The minimum income threshold for the Top 10% was $141,000.)

https://money.cnn.com/2016/01/07/news/economy/top-1/index.ht...